/Engine/Plugins/Online/OnlineServices/Source/OnlineServicesInterface/Public/Online/Sessions.h
Starts the matchmaking process, which will either create a session with the given parameters, or join one that matches the given search filters.
[TOnlineAsyncOpHandle](API\Plugins\OnlineServicesInterface\Online\TOnlineAsyncOpHandle)< [FStartMatchmaking](API\Plugins\OnlineServicesInterface\Online\FStartMatchmaking) > StartMatchmaking ( [FStartMatchmaking::Params](API\Plugins\OnlineServicesInterface\Online\FStartMatchmaking\Params) && Params )